# What amount of a substance is contained in one kg: a) sodium chloride (NaCl) b) nitrogen oxide (NO2)

What amount of a substance is contained in one kg: a) sodium chloride (NaCl) b) nitrogen oxide (NO2) c) aluminum sulfide (Al2S3) d) calcium chloride (Ca2P3) e) barium chloride (BuF2)

a) M (NaCl) = Mr (NaCl) = Ar (Na) * N (Na) + Ar (Cl) * N (Cl) = 23 * 1 + 35.5 * 1 = 58.5 g / mol;
n (NaCl) = m (NaCl) / M (NaCl) = 1000 / 58.5 = 17.1 mol;
b) M (NO2) = Mr (NO2) = Ar (N) * N (N) + Ar (O) * N (O) = 14 * 1 + 16 * 2 = 46 g / mol;
n (NO2) = m (NO2) / M (NO2) = 1000/46 = 22 mol;
c) M (Al2S3) = Mr (Al2S3) = Ar (Al) * N (Al) + Ar (S) * N (S) = 27 * 2 + 32 * 3 = 150 g / mol;
n (Al2S3) = m (Al2S3) / M (Al2S3) = 1000/150 = 7 mol;
d) M (CaCl2) = Mr (CaCl2) = Ar (Ca) * N (Ca) + Ar (Cl) * N (Cl) = 40 * 1 + 35.5 * 2 = 111 g / mol;
n (CaCl2) = m (CaCl2) / M (CaCl2) = 1000/111 = 9 mol;
e) M (BaCl2) = Mr (BaCl2) = Ar (Ba) * N (Ba) + Ar (Cl) * N (Cl) = 137 * 1 + 35.5 * 2 = 208 g / mol;
n (BaCl2) = m (BaCl2) / M (BaCl2) = 1000/208 = 4.8 mol.

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